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[Image] Smaller and Lighter Lithium-Ion Batteries Energy Source for Hybrid Vehicles, reducing CO2 Emissions

Lithium-Ion Batteries are quickly becoming an efficient energy choice used to power the vehicles of tomorrow. Hitachi is helping to deliver a clean and comfortable global experience by supplying Lithium-Ion Batteries for use in hybrid electric vehicles.

Lithium-Ion Batteries on the Rise

Measures are being adopted in a variety of different fields to help prevent global warming by reducing CO2 emissions. As a result, the automotive industry has become a focal point when considering impact on the environment.
More importantly, advances in environmental technology, such as the emergence of hybrid electric vehicles in the 1990's, have brought innovation to an era where vehicles have been traditionally powered by gasoline. The key feature of hybrid technology is surrounded by the augmentation of the engine with an electric motor, ultimately achieving improved fuel economy and significantly reducing the amount of CO2 produced by the burning of fuel.

[Image] Leading contender for clean motoring!

The Lithium-Ion Battery has attracted attention due to its potential for use in hybrid electric vehicles. Hitachi is a leader in its development. What's more, the market for Lithium-Ion Batteries is rapidly expanding as an alternative to the nickel-metal hydride batteries, which have been utilized in the hybrid market thus far. In addition to its smaller size and lighter weight, Lithium-Ion Batteries deliver performance that helps to protect the environment with features such as improved charge efficiency without memory effect(*1).
In an environment where motor vehicle requirements including lower exhaust emissions and better fuel economy are prevalent, it is anticipated that the practical use of hybrid, electric, and fuel cell vehicles will continue to increase.

Memory effect: The effect observed by repeatedly recharging a battery while it still contains a certain level of charge, causing the discharge voltage to lessen and the capacity of the battery to diminish as a result.

[Image] Advances in Lithium-Ion Battery Technology

Lithium-Ion Batteries Basics

Currently, Lithium-Ion Batteries are widely used in mobile phones and notebook PCs because they have the durability to be recharged and reused repeatedly. The compactness, lightweight and durability, coupled with its powerful characteristics in these batteries, have created a demand for use as small batteries in mobile devices and the larger batteries for hybrid electric vehicles.

[Image] Lithium-Ion Battery and Lithium-Ion Battery module

[Image] Small and Durable

Our third-generation Lithium-Ion Battery being mass produced since 2010 has the power density of about three times in comparison with a nickel-metal hydride battery in present market, and our fourth-generation currently under development has the power density of about four times. The batteries also produce higher output (boosting vehicle power), higher efficiency (avoiding wasteful use of electricity), and provides excellent durability, compared with the life of the battery being roughly equivalent to the life of the vehicle. They are regarded as the leading role of next-generation battery.
The Lithium-Ion Batteries supplied by Hitachi are flourishing in a wide range of different applications including cars, buses, commercial vehicles and trains.

[Image] Left : Achivement scene of a lithium ion battery

Provision of System Products for Hybrid Electric Vehicles

Systems for hybrid electric vehicles are comprised of several critically important components. In addition to the Lithium-Ion Batteries, the system capability also includes electric motor to augment the engine, and a power inverter to drive the motor. Hitachi has created a high level of confidence, trust and global recognition for its in-house production including these system components. In fact, Hitachi has been at the forefront, establishing full-scale production of Lithium-Ion Batteries for hybrid electric vehicles and supplying the product to customers in Japan, North America and other countries around the world.

[Image] An example of system diagram for Hybrid electric vehicles

[Image] Response to the demand for more than 100,000 units of HEVs

Hitachi Group has brought together not only electronic control technologies and automotive battery technologies, but also the material and component technologies. It has an extensive track record of supplying products ranging from battery cells to battery system packs, mainly to automobile manufacturers and railway companies.
Hitachi will continue to contribute to the future of the global environment with products that emphasize long life, high output, high energy density, high reliability and low cost.

The Hitachi Group views the Lithium-Ion Batteries for Hybrid Electric Vehicles as one of the ways we can achieve our Environmental Vision 2025, with a goal of helping to reduce annual CO2 emissions by 100 million tons by 2025 through our products and services.

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